If a diesel engine runs opposite direction what will happen?

MISFIRERING IF THE CAMSHAST LOOSE OR DAMAGE THEET 

In  a 4 stroke diesel engine i doubt if it will work as the valve timing and stroke phase will mostly be out of phase also fuel injection system will not coordinated with electronic signals from crankshaft and camshaft.Meanwhile i think it could work in a 2 stroke diesel engine 

the direction of rotation of crankshaft changes. it is of no serious consequence but you must make it to run in the right direction(by adjusting the camshaft position),the direction that you want.

• The mechanical coupling that connects the normal electrical motor driver to the pump shaft may suddenly break and disconnect the pump from its driver causing severe damage to the coupling.

The entry will turn into exhaust. The exhaust turns to entry. Oil pump will stop. It will take about half a minute. Then the engine stop. Engine performance will improve after this reverse operation.

some unfortunate things can happen:

• The mechanical coupling that connects the normal electrical motor driver to the pump shaft may suddenly break and disconnect the pump from its driver;
• The electrical power source supplying the electrical motor driver may suddenly fail – causing a “black out”.
• The pump may suddenly lose its suction prime – such as sucking air or a vapor, or “cavitating” (a phenomena where the pumped fluid is vaporized because it reaches its vapor pressure temperature and then suddenly collapses). The net result of any of these things is that the pump suddenly stops pumping for a while – which means that it stops generating a discharge fluid pressure to overcome that which exists at the target of its flow.